curious to know if vac suits be able to use in fighters?
Though similar to flight suits when dealing with space (48hrs or 2 days), the large backpack, would that hinder movement or stop pilot from getting into cockpit?

At the moment, nothing suggests that it will not be possible. But an accurate set of rules will be released prior to combat, so it would be best to wait until then, as rules are always liable to change as development continues.